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Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.

POST /v1/passkey/StartRegistration — openapi

Initiates Passkey registration by providing credential creation options.

Endpoint

Method: POST

Path: /v1/passkey/StartRegistration

Servers:

• https://auth.roblox.com

Parameters

[
  {
    "in": "query",
    "name": "flow",
    "schema": {
      "type": "string"
    }
  }
]

Request Body

{
  "content": {
    "application/json": {
      "schema": {
        "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.StartPasskeyRegistrationRequest"
      }
    },
    "text/json": {
      "schema": {
        "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.StartPasskeyRegistrationRequest"
      }
    }
  },
  "required": true
}

Responses

{
  "200": {
    "description": "OK",
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.StartPasskeyRegistrationResponse"
        }
      },
      "text/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.StartPasskeyRegistrationResponse"
        }
      }
    }
  },
  "401": {
    "description": "0: Authorization has been denied for this request.\r\n0: An unknown error occurred with the request."
  },
  "403": {
    "description": "0: Token Validation Failed\r\n1: Reached limit of pass keys registered."
  },
  "503": {
    "description": "2: Feature disabled."
  }
}

Authentication

{
  "security": [
    {},
    {
      "roblox-legacy-cookie": []
    }
  ],
  "securitySchemes": {
    "roblox-api-key": {
      "type": "apiKey",
      "description": "A configurable key that allows granular access to Roblox resources. See https://create.roblox.com/docs/cloud/auth/api-keys for more information.",
      "name": "x-api-key",
      "in": "header"
    },
    "roblox-legacy-cookie": {
      "type": "apiKey",
      "description": "A browser cookie that represents the identity of a Roblox user. DO NOT SHARE THIS. Sharing this will allow someone to log in as you and to steal your Robux and items. We do not recommend using cookies to call endpoints. When possible, use API keys with the x-api-key header or OAuth 2.0 instead for authentication.",
      "in": "cookie",
      "name": ".ROBLOSECURITY"
    },
    "roblox-oauth2": {
      "type": "oauth2",
      "description": "Build or authorize apps to access Roblox resources. See https://create.roblox.com/docs/cloud/auth/oauth2-overview for more information.",
      "flows": {
        "authorizationCode": {
          "authorizationUrl": "https://apis.roblox.com/oauth/v1/authorize",
          "tokenUrl": "https://apis.roblox.com/oauth/v1/token",
          "refreshUrl": "https://apis.roblox.com/oauth/v1/token",
          "scopes": {}
        }
      }
    }
  }
}

Related Schemas

• Roblox.Authentication.Api.Models.Request.StartPasskeyRegistrationRequest

• Roblox.Authentication.Api.Models.Response.StartPasskeyRegistrationResponse

Complete Operation Definition

{
  "tags": [
    "Accounts"
  ],
  "summary": "Initiates Passkey registration by providing credential creation options.",
  "parameters": [
    {
      "in": "query",
      "name": "flow",
      "schema": {
        "type": "string"
      }
    }
  ],
  "requestBody": {
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.StartPasskeyRegistrationRequest"
        }
      },
      "text/json": {
        "schema": {
          "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Request.StartPasskeyRegistrationRequest"
        }
      }
    },
    "required": true
  },
  "responses": {
    "200": {
      "description": "OK",
      "content": {
        "application/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.StartPasskeyRegistrationResponse"
          }
        },
        "text/json": {
          "schema": {
            "$ref": "#/components/schemas/Roblox.Authentication.Api.Models.Response.StartPasskeyRegistrationResponse"
          }
        }
      }
    },
    "401": {
      "description": "0: Authorization has been denied for this request.\r\n0: An unknown error occurred with the request."
    },
    "403": {
      "description": "0: Token Validation Failed\r\n1: Reached limit of pass keys registered."
    },
    "503": {
      "description": "2: Feature disabled."
    }
  },
  "servers": [
    {
      "url": "https://auth.roblox.com"
    }
  ],
  "x-roblox-engine-usability": {
    "apiKeyWithHttpService": false
  },
  "security": [
    {},
    {
      "roblox-legacy-cookie": []
    }
  ],
  "externalDocs": {
    "url": "https://create.roblox.com/docs/cloud/reference/features/accounts#auth_post_v1_passkey_StartRegistration"
  }
}